Chung-Cheng Yen
Engineering Consultant

Professional Profile

Dr. Yen is an engineering consultant at Hromadka & Associates whose expertise is in surface and groundwater hydrology and hydraulics. He specializes in computer modeling techniques. Dr. Yen has done extensive work developing drainage master plans for several cities and counties, including San Diego, Los Angeles, Corona, Santa Clarita, Yucaipa, Coalinga, Fullerton, Santa Ana, Laguna Beach, Arcadia, and Torrance. His work experience also includes the following: Comprehensive Storm Drain Plan #4 for County of San Bernardino, San Sevaine Channel Deficiency Study, San Joaquin Hill Transportation Corridor Runoff Management Plan, Channel Inundation Studies for County of Orange East Garden Grove – Wintersburg (CO5) and Oceanview (CO6), Flood Control Planning and Design Opportunities for Bolsa Chica, and Groundwater Modeling for Santa Monica, Turlock Irrigation District, and Mission Valley Terminal.

Before joining the Hromadka & Associates team, Dr. Yen held the positions of Senior Engineer at Integral Consultants, Senior Engineer at Exponent Failure Analysis Associates, Associated/Senior Engineer at Boyle Engineering Corporation, and Hydrologist at Williamson & Schmidt / Huitt-Zollars.

Education

Ph.D. (Civil Engineering), 1985, University of California at Irvine
M.S. (Civil Engineering), 1982, University of California at Irvine
B.S. (Civil Engineering), 1975, Chung Yuan College, Chung-Li Taiwan, Republic of China

Licenses

Registered Professional Civil Engineer, California, (49913)

Project Summary
  • County of San Diego, Master Plan of Drainage
  • City of Los Angeles, Master Plan of Drainage
  • Comprehensive Storm Drain Plan #4, County of San Bernardino
  • Santa Monica MTBE Groundwater Model
  • Turlock Irrigation District Groundwater Model Update
  • Mission Valley Terminal Groundwater Model
  • City of Corona, Master Plan of Drainage
  • City of Fontana, San Sevaine Channel Deficiency Study
  • City of Los Angeles, Master Plan of Drainage – Pilot Project
  • City Santa Clarita, Master Plan of Drainage
  • County of San Bernardino, San Sevaine Channel Hydrology
  • San Joaquin Hill Transportation Corridor - Runoff Management Plan
  • City of Yucaipa, Master Plan of Drainage
  • City of Coalinga, Master Plan of Drainage
  • City of Fullerton, Master Plan of Drainage
  • City of Santa Ana, Master Plan of Drainage
  • City of Laguna Beach, Master Plan of Drainage
  • City of Arcadia, Master Plan of Drainage
  • City of Torrance, Master Plan of Drainage
  • County of Orange, East Garden Grove - Wintersburg (C05) and Oceanview (C06) Channels Inundation Studies
  • Koll Company, Flood Control Planning and Design Opportunities for Bolsa Chic

Publications

Books

1. Hromadka II, T.V. and Yen, C.C., 1986, Complex Variable Boundary Elements, Computational Mechanics Press.

2. Hromadka II, T.V., McCuen, R.H. and Yen, C.C., 1987, Computational Hydrology in Flood Control Design and Planning, Lighthouse Publications.

3. Hromadka II, T.V., Yen, C.C. and Pinder, G.F., 1987, The Best Approximation Method - An Introduction, Springer-Verlag Publishers, Lecture Notes Series, Number 27.

Government Agency Research Publications
(Refereed and approved for Public Release)

1. Hromadka II, T.V. and Yen, C.C., 1987, A Diffusion Hydrodynamic Model (DHM), U.S.G.S. Water Resources Division Special Report 87-4137.

2. Yen, C. C. and Guymon, G. L., 1988, An Efficient Deterministic-Probabilistic Approach   to Modeling Regional Ground-Water Flow: Theory, U.S. Geological Survey, Open-File Report 88-90.

3. Guymon, G. L. and Yen, C. C., 1988, An Efficient Deterministic-Probabilistic Approach to Modeling Regional Ground-Water Flow: Application to Owens Valley, CA, U.S. Geological Survey, Open-File Report 88-91.

Refereed Journal and Full Conference Papers

1. Hromadka II, T.V., Yen, C.C. and Guymon, G.L., 1985, The Complex Variable Boundary Element Method:  Applications, Numerical Methods in Engineering, Vol. 21, pg. 1013-1025.

2. Hromadka II, T.V. and Yen, C.C., 1987, Complex Boundary Element Solution of Flow-Field Problems Without Matrices, Engineering Analysis, Vol. 4, No. 1, pg. 25-34.

3. Hromadka II, T.V. and Yen, C.C., 1986, A Model of Groundwater Contaminant Transport Using the CVBEM, International Journal of Computational Mechanics, Vol. 1, pg. 105-113, Springer-Verlag Publishers.

4. Hromadka II, T.V. and Yen, C.C., 1986, Solving Time-Dependent Slow Moving Interface Problems in Heat Transfer Using the CVBEM, Proceedings:  International Conf. on Computational Mechanics (ICCM86 Tokyo), Japan Society of Mechanical Engineering (JSME), published by Springer-Verlag publishers, pg. VII-3 thru VIII-11.

5. Yen, C.C., Hromadka II, T.V. and Lai, Chintu, 1986, The Complex Variable Boundary Element Method in Groundwater Contaminant Transport, Proceedings:  International Conf. on Computational Mechanics, (ICCM86 Tokyo), JSME, Springer-Verlag publishers, pg. XI-137 thru XI-142.

6. Hromadka II, T.V., McCuen, R.H. and Yen, C.C., 1987, A Comparison of Overland Flow Hydrograph Models, ASCE Hydraulics Division Journal, Vol. 113, No. 11, pg. 1422-1440.

7. Yen, C.C. and Hromadka II, T.V., 1986, Complex Polynomial Approximation of Two-Dimensional Potential Problems Using Generalized Fourier Series, Microsoftware for Engineers, Vol. 2, No. 2, pg. 75-81.

8. Hromadka II, T.V. and Yen, C.C., 1986, A Diffusion Hydrodynamic Model:  I. Model  Development, Advances in Water Resources, Vol. 9, No. 3, pg. 118-121.

9. Hromadka II, T.V. and Yen, C.C., 1986, A Diffusion Hydrodynamic Model:  II. Verification of the Diffusion Hydrodynamic Model (DHM), Advances in Water Resources, Vol. 9, No. 3, pg. 122-131.

10. Hromadka II, T.V. and Yen, C.C., 1986, A Diffusion Hydrodynamic Model:  III. Program Description of DHM Model, Advances in Water Resources, Vol. 9, No. 3, pg. 131-135.

11. Hromadka II, T.V. and Yen, C.C., 1986, A Diffusion Hydrodynamic Model:  IV. Applications of the DHM, Advances in Water Resources, Vol. 9, No. 3, pg. 136-155.

12. Hromadka II, T.V. and Yen, C.C., 1986, A Diffusion Hydrodynamic Model:  V. Comparison Between Kinematic Routing and DHM Model, Advances in Water Resources, Vol. 9, No. 3, pg. 156-170.

13. Hromadka II, T.V., Yen, C.C. and Pinder, G.F., 1987, Approximating a Linear Operator Equation Using a Generalized Fourier Series:  Applications, Engineering Analysis, Vol. 4,  No. 4, pg. 214-220.

14. McCuen, R.H., Yen, C.C. and Hromadka II, T.V., 1986, Adjusting Stream Gage Data for Urbanization Effects, Microsoftware for Engineers, Vol. 2, No. 4, pg. 219-224.

15. Hromadka II, T.V. and Yen, C.C., 1986, Isothermal Phase Change Model for Freezing and Thawing Soils II:  Model, Environmental Software, Vol. 1, No. 2, pg. 118-123.

16. Yen, C.C. and Hromadka II, T.V., 1986, Complex Variable Boundary Element Solution of Groundwater Contaminant Transport, Proceedings:  ENVIROSOFT'86 Conference, Computational Mechanics Press, pg. 409-419.

17. Hromadka II, T.V. and Yen, C.C., 1986, Evaluation of Flooding Due to Urbanization, Proceedings:  ENVIROSOFT'86 Conference, Computational Mechanics press, pg. 503-519.

18. Hromadka II, T.V., Yen, C.C. and Seits, M.H., 1987, A Comparison of Techniques for Evaluating Hydrologic Model Uncertainty, Probabilistic Engineering Mechanics, Vol. 2, No. 1, pg. 25-37.

19. Hromadka II, T.V. and Yen, C.C., 1987, Computing the Steady State Freezing Front Location in Two-Dimensional Algid Soils, Proceedings:  ASCE OMAE Conference, Houston, Texas.

20. Yen, C.C. and Hromadka II, T.V., 1987, CVBEM Modeling of Tracking Two-Dimensional Freezing Fronts in Algid Soil, Proceedings:  ASME OMAE Conference, Houston, Texas.

21. Yen, C.C. and Hromadka II, T.V., 1988, A Simple Hydrologic Mass Balance Model, Microsoftware for Engineers, Vol. 4, No. 2, pg. 70-87.

22. Hromadka II, T.V., McCuen, R.H. and Yen, C.C., 1988, Effect of Watershed Subdivision on Prediction Accuracy of Hydrologic Models, HYDROSOFT, Computational Mechanics Press, Vol. 1, No. 1, pg. 19-28.

23. Hromadka II, T.V., McCuen, R.H., Whitley, R.J. and Yen, C.C., 1991, Discretization of Hydrologic Models, Hydrological Science and Technology, American Institute of Hydrology, Vol. 6, No. 1-4, pg. 73-92.

24. Hromadka II, T.V. and Yen, C.C., 1987, The Complex Variable Boundary Element Method Applied to Automotive Streamlining, Proceedings:  COMPAUTO Conference, Lucerne, Switzerland, Computational Mechanics Press.

25. Hromadka II, T.V. and Yen, C.C., 1991, Computer Modeling of Groundwater Contaminant Transport Using Complex Variable Approximations, Speaker, National Research & Development Conference on the Control of Hazardous Materials, Feb. 20-22, 1991, Hazardous Materials Control Research Institute, Maryland, Proceedings, pg. 173-178.

26. Hromadka II, T.V. and Yen, C.C., 1988, Unit Hydrograph Models and Uncertainty Distributions, Proceedings:  ENVIROSOFT'88 Conference, Porto Carras, Greece, Computational Mechanics Press, pg. 281-291.

27. Yen, Chung-Cheng and Hromadka II, T.V., 1987, CVBEM Analysis in Subsurface Hydraulics, Proceedings of the First International Computational Hydrology Conference, Anaheim, California, pg. G-21 thru G-24.

28. Seits, M.H., Hromadka II, T.V. and Yen, C.C., 1988, Analysis of a Hydrologic Model for Predicting Surface-Flow Storm Runoff, HYDROSOFT, Vol. 1, No. 3, pg. 110-127.

29. Hromadka II, T.V., Burchard, W.V., Yen, C.C. and Young, W.F., 1988, Design and Analysis for Runoff and Nuisance Flow in an Urban Watershed, HYDROSOFT, Vol. 1, No. 4, pg. 162-167.

30. Hromadka II, T.V. and Yen, C.C., 1988, Extension of the CVBEM to Higher Order Trial Functions, Applied Mathematical Modeling, Vol. 12, pg. 619-626.

31. Hromadka II, T.V., Walker, T.R. and Yen, C.C., 1988, Using the Diffusion Hydrodynamic Model (DHM) to Evaluate Flood Plain Environmental Impacts, Environmental Software, Vol. 3, No. 1, pg. 4-11.

32. Hromadka II, T.V. and Yen, C.C., 1990, The Rational Method in Stormwater Management Modeling of Peak Flow Flood Control Systems, II:  Computer Application, Environmental Software, Vol. 4, No. 3, pg. 130-135.

33. Yen, C.C. and Hromadka II, T.V., 1988, Interactive Hydraulic Analysis for Storm Drain Pipe Systems, HYDROSOFT, Computational Mechanics Publications, Vol. 1, No. 4, pg. 181-192.

34. Hromadka II, T.V., Walker, T.R., Yen, C.C. and DeVries, J.J., 1989, Application of the U.S.G.S. Diffusion Hydrodynamic Model for Urban Floodplain Analysis, Water Resources Bulletin, Vol. 25, No. 5, pg. 1063-1071.

35. Yen, C.C. and Hromadka II, T.V., 1990, A Unified Computer Model for Irregular Channel Hydraulics, Software for Engineering Work Stations, Vol. 5, No. 4, pg. 171-183.

36. Yen, C.C. and Hromadka II, T.V., 1990, Time-Area Diagram and Peak Flow Estimates Using Rational Method Link-Node Modeling, HYDROSOFT, Vol. 3, No. 4, pg. 184-186.

37. Hromadka II, T.V., Yen, C.C. and DeVries, J.J., 1989, Groundwater Contaminant Transport Using the Complex Variable Boundary Element Method, 17th Biennial Conference on Ground Water, September 25-26, 1989, San Diego, California.

38. Hromadka II, T.V., Yen, C.C. and Bajak, P.A., 1992, Application of the U.S.G.S. Diffusion Hydrodynamic Model (DHM) in Evaluation of Estuary Flow Circulation, Advances in Engineering Software, Vol. 14, pg. 291-301.

39. Yen, C.C. and Hromadka II, T.V., 1990, Hydraulic Analysis for Box Culvert Systems, HYDROSOFT, Vol. 3, No. 1, pg. 10-18.

40. Yen, C. C. and Guymon, G. L., 1990, An Efficient Deterministic-Probabilistic Approach to Modeling Regional Groundwater Flow, 1, Theory,” Water Resources Research, Vol. 26(7), pp. 1559-1568.

41. Guymon, G. L. and Yen, C. C., 1990, An Efficient Deterministic-Probabilistic Approach to Modeling Regional Groundwater Flow, 2, Application to Owens Valley, California,” Water Resources Research, Vol. 26(7), pp. 1569-1594.

42. Hromadka II, T.V., Yen, C.C., Nestlinger, A.J. and Jordan, N.M., 1993, East Garden Grove-Wintersburg (C05) and Oceanview (C06) Channel Inundation Study Using the Diffusion Hydrodynamic Model, Proceedings:  ASCE Workshop on Stormwater Management, California State University, Long Beach, California, pg. 14-27.

43. Hromadka II, T.V., Whitley, R.J., McCuen, R.H. and Yen, C.C., 1992, Development of Confidence Interval Estimates for Predictions from a Rainfall-Runoff Model, Environmental Software, Vol. 7, No. 2, pg. 61-72.

44. Hromadka II, T.V., DeVries, J.J., Yen, C.C. and Nestlinger, A.J., 1991, Application of the USGS Diffusion Hydrodynamic Model for River Overflow Floodplain Analysis, Invited Paper, ASCE Engineering Workshop on Hydraulic and Environmental Aspects of Rivers, California State University, Long Beach, May 18, 1991 (see item 186), Proceedings:  pg. 117-125.

45. Hromadka II, T.V. and Yen, C.C., 1995, Using a Cost-of-Benefit Index (CBI) to Set Priorities for a City Master Plan of Drainage System, J. Environmental Software, Vol. 10, No. 1, pg. 1-9.

46. Hromadka II, T.V. and Yen, C.C., 1995, Stormwater Pollutant Loading Estimation:  Using GIS and Master Plans of Drainage, Proceedings:  Arid West Conference, Association of State Floodplain Managers, January 24-26, 1995, San Diego, California, pg. 64-74.

47. Hromadka II, T.V. and Yen, C.C., 1995, Stormwater Pollutant Loading Estimation:  A Simple Continuity Model, Proceedings:  Arid West Conference, Association of State Floodplain Managers, January 24-26, 1995, San Diego, California, pp. 45-63.

48. Hromadka II, T.V. and Yen, C.C., 1996, An Integrated Storm Water Management/GIS Software System, Environmental Software, Vol. 11, No. 4, pg. 209-219.

49. Hromadka II, T.V., Yen, C.C. and Smith, D., 2000, Development of Data Base and Statistical Analysis of Water Quality Data for the Los Angeles Region, Journal of Floodplain Management, Vol. 2, No. 1, pp. 13-27.

50. Hromadka II, T.V., Whitley, R.J. and Yen, C.C., 2001, A Generalized 3D Complex Variable Boundary Element Method (CVBEM): Applications, “Seminars in Advanced Computing”, Wessex Institute of Technology, Southampton, England, March 27, 2001, University of Wales, Swansea.

(51.) Hromadka II, T.V., Whitley, R.J. and Yen, C.C., A Generalized 3D CVBEM Complex Variable Boundary Element Method (CVBEM), International Journal of Numerical Methods in Engineering, (2001), in-review.

(52.) *Yen, C.C. and Hromadka II, T.V., Synthesis of Rainfall-Runoff Data for Frequency Analysis, Journal of Environmental Software, (2001), in-review.

(53.) Hromadka II, T.V. and Yen, C.C., A Comparison of the 3D Real and Complex Variable Boundary Element Methods (BEM), Boundary Element Communications, (2001), in-review.

Note: ((   )) reflects Conference papers presented but Proceedings not received.
(  )* ready for a future Conference.


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